Japan will experience clear, blue skies across the country on Mother's Day, May 10, 2026 [1].
The forecast is significant for millions of families planning outdoor celebrations, though officials warn that the sunny conditions bring specific health and safety risks.
Seasonal high-pressure conditions are producing the clear weather from Kyushu in the south to Hokkaido in the north [2]. While the skies are ideal for outdoor activities, the combination of strong sunlight and low humidity increases the risk of fire and heightens UV exposure [2]. Forecasters said the strong UV levels require the use of hats and parasols for protection [1].
Temperature variations will be pronounced throughout the day, particularly in northern Japan [2]. In the southern and central regions, maximum temperatures are expected to reach around 24 °C [1]. Specifically, Tokyo is forecast to reach 24 °C, while Osaka, Nagoya, and Okayama are expected to hit 25 °C [1].
Further north, the temperatures remain slightly cooler. Aomori is forecast at 23 °C and Sendai at 24 °C [1]. In the Hokuriku region and northern Japan, maximum temperatures will hover around 22 °C [1]. This includes Sapporo at 22 °C and Niigata at 22 °C [1]. Morioka is expected to reach 21 °C, while Kanazawa will be 20 °C [1]. The lowest forecast among major hubs is Kushiro at 17 °C [1].
Despite the generally stable conditions for the holiday, the weather may be volatile later in the week. Forecasters said there is a possibility of sudden weather changes mid-week, even if the skies remain clear initially [1, 2].
“Japan will experience clear, blue skies across the country on Mother's Day.”
The alignment of high-pressure systems provides a window of stable weather for a major cultural holiday, but the accompanying dry air and UV intensity shift the public health focus toward sun protection and fire prevention. The predicted mid-week volatility suggests a transition in seasonal weather patterns following the holiday weekend.
